Tread plate flooring



FIG. 1 is a front perspective view of the tread plate flooring, the broken lines illustrate the environment of the invention and forms no part of the claimed design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side view, the right side view being a mirror image thereof; and,

FIG. 5 is an enlarged view of the tread plate design thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a tread plate flooring, as shown and described. 